Virtualisation

Question 1

What is a type 1 hypervisor?

Answer 1

Speciality software for enterprise deployment of virtual machines on server hardware. Eg ESXI, hyper-v

Question 2

What is a type 2 hypervisor?

Answer 2

Software built for personal of desktop computers. EG parallels, virtual Box

Question 3

What is Network Function Virtualisation (NFV)?

Answer 3

The virtualisation of physical networking devices, such as routers, wlc, asa, (csr1000v)

Question 4

What is single-root I/O virtualisation?

Answer 4

The sharing of a single physical NIC to multiple VNF devices.

Question 5

How does single-root I/O virtualisation work?

Answer 5

Physical NIC is abstracted into multiple virtual functions (VF)

These VFs can be assigned to the individual VNF instances.

No virtual switch is used.

Question 6

What is edge virtual bridging?

Answer 6

Using a physical switch to pass layer 2 traffic between VMs on a single host.

Question 7

What are the two types of Edge Virtual Bridging (EVB)?

Answer 7

Internal Edge Virtual bridging

External Edge Virtual Bridging

Question 8

What is Internal Edge Virtual Bridging?

Answer 8

The physical NIC includes a virtual switch that bridges traffic between VFs

Also called Virtual Ethernet Bridging

Question 9

What’s is External Edge Virtual Bridging?

Answer 9

Traffic from a VNF leaves the host, hits a switch, and comes back up the same link into the host.

Also known as hair pinning or reflective relay.

Question 10

What does switchport mode virtual Ethernet-bridge enable?

Answer 10

For a switch to send traffic back down the interfaces for which the frame was received.

Question 11

Why are network overlays used?

Answer 11

The provide functionality that the underlay cannot, I.e segmentation, access control or encryption.